Journal Article10.1002/ADMA.201800868
Over 14% Efficiency in Polymer Solar Cells Enabled by a Chlorinated Polymer Donor.
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TL;DR: This work establishes a more economical design paradigm of replacing fluorine with chlorine for preparing highly efficient polymer donors and exhibits higher open circuit voltage than the PBDB-T-2Cl-based PSCs, leading to an outstanding power conversion efficiency of over 14%.
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Abstract: Fluorine-contained polymers, which have been widely used in highly efficient polymer solar cells (PSCs), are rather costly due to their complicated synthesis and low yields in the preparation of components. Here, the feasibility of replacing the critical fluorine substituents in high-performance photovoltaic polymer donors with chlorine is demonstrated, and two polymeric donors, PBDB-T-2F and PBDB-T-2Cl, are synthesized and compared in parallel. The synthesis of PBDB-T-2Cl is much simpler than that of PBDB-T-2F. The two polymers have very similar optoelectronic and morphological properties, except the chlorinated polymer possess lower molecular energy levels than the fluorinated one. As a result, the PBDB-T-2Cl-based PSCs exhibit higher open circuit voltage (Voc ) than the PBDB-T-2F-based devices, leading to an outstanding power conversion efficiency of over 14%. This work establishes a more economical design paradigm of replacing fluorine with chlorine for preparing highly efficient polymer donors.
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Citations
Modulating Structure Ordering via Side-Chain Engineering of Thieno[3,4-b]thiophene-Based Electron Acceptors for Efficient Organic Solar Cells with Reduced Energy Losses.
Feng Liu,Jianyun Zhang,Yuming Wang,Shanshan Chen,Zichun Zhou,Changduk Yang,Feng Gao,Xiaozhang Zhu +7 more
TL;DR: The results implied that the side chain engineering is an efficient approach in regulating the electronic structure and molecular packing of NFAs, which can well match with polymer donor and obtain high PCEs of the OSCs with improved Voc, Jsc and FF, simultaneously.
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Thiophene–Perylenediimide Bridged Dimeric Porphyrin Donors Based on the Donor–Acceptor–Donor Structure for Organic Photovoltaics
TL;DR: In this paper , two D-A-D (D = donor, A = acceptor)-based small-molecule donors, TPDI-2P and F-TPDI2P, were designed and synthesized for organic solar cells (OSCs), with two strong donor porphyrin units bridged by either an electron-deficient diethynyl-substituted thiophene-perylenediimide (tPDI) linker for the former or a diethYNyl-fused TPDi linker, for the latter; 3-ethylrhodanine units were then flanked symmetrically by phenylenethynylene π-linkers.
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A new chlorinated non-fullerene acceptor based organic photovoltaic cells over 12% efficiency
Rui Cao,Yu Chen,Fangfang Cai,Honggang Chen,Wei Liu,Hui-lan Guan,Qingya Wei,Jing Li,Qin Chang,Zhe Li,Yingping Zou +10 more
TL;DR: In this article, a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups.
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